<template>
    <div>
        <!--:model相当于v-bind:model的缩写，未双向绑定-->
        <el-form ref="loginForm" :model="loginForm" class="loginContainer" :rules="rules"
                 v-loading="loading"
                 element-loading-text="正在登陆..."
                 element-loading-spinner="el-icon-loading"
                 element-loading-background="rgba(0, 0, 0, 0.8)">
            <h3 class="loginTitle">系统登录</h3>
            <el-form-item prop="username">
                <el-input  type="text" v-model="loginForm.username" placeholder="请输入密码" auto-complete="false"></el-input>
            </el-form-item>
            <el-form-item prop="password">
                <el-input v-model="loginForm.password" placeholder="请输入密码" type="password" auto-complete="false"></el-input>
            </el-form-item>
            <el-form-item prop="code">
                <el-input v-model="loginForm.code" placeholder="点击图片更换验证码" type="text"
                          @keydown.enter.native="submitForm('loginForm')"
                          auto-complete="false" style="width: 200px"></el-input>
                <img class="captcha_img" :src="captchaUrl"  @click="updateCaptcha">
            </el-form-item>
            <el-form-item>
                <el-checkbox v-model="checked" class="loginRemember">记住我</el-checkbox>
            </el-form-item>
            <el-form-item>
                <el-button type="primary" STYLE="width: 100%" @click="submitForm('loginForm')">登录</el-button>
            </el-form-item>
        </el-form>
    </div>
</template>

<script>
    export default {
        name: "Login",
        data(){
            return{
                checked:true,
                captchaUrl:'/captcha?time='+new Date(),
                loginForm:{
                    username:'admin',
                    password:'123',
                    code:''
                },
                loading:false,
                rules: {
                    username: [
                        { required: true, message: '请输入用户名', trigger: 'blur' }
                    ],
                    password: [
                        { required: true, message: '请输入密码', trigger: 'blur' }
                    ],
                    code: [
                        { required: true, message: '请输入验证码', trigger: 'blur' }
                    ]
                }
            }
        },
        methods:{
            updateCaptcha(){
                this.captchaUrl='/captcha?time='+new Date();
            },
            submitForm(loginForm){
                this.$refs.[loginForm].validate((valid) => {
                    if (valid) {
                        this.loading = true;
                        this.postRequest('/login', this.loginForm).then(resp => {
                            if (resp) {
                                this.loading = false;
                                //存储用户token
                                const tokenStr = resp.obj.tokenHead + resp.obj.token;
                                window.sessionStorage.setItem('tokenStr', tokenStr)
                                //跳转
                                let path = this.$route.query.redirect;
                                //当有主页以外页面调到登录页，就跳回，否则去主页
                                this.$router.replace((path === '/' || path === undefined) ? '/home' : path)
                            }
                        })
                    } else {
                        this.$message.error('请正确输入所有字段')
                        return false;
                    }
                });
            }
        }
    }
</script>

<style>
    .loginContainer{
        border-radius: 18px;
        background-clip: padding-box;
        margin: 180px auto;
        width: 350px;
        padding: 15px 35px 15px 35px;
        background: #fff;
        border: 1px solid #eaeaea;
        box-shadow: 0 0 25px #cac6c6;
    }
    .loginTitle{
        margin: 0px auto 40px auto;
        text-align: center;
    }
    .loginRemember{
        text-align: left;
    }
    .el-form-item__content{
        display: flex;
        align-items: center;
    }
    .captcha_img{
        padding: 0px 15px;
    }
</style>